intersection method Null safety

Set<E> intersection(
  1. Set<Object?> other

Creates a new set which is the intersection between this set and other.

That is, the returned set contains all the elements of this Set that are also elements of other according to other.contains.

final characters1 = <String>{'A', 'B', 'C'};
final characters2 = <String>{'A', 'E', 'F'};
final unionSet = characters1.intersection(characters2);
print(unionSet); // {A}


Set<E> intersection(Set<Object?> other) {
  Set<E> result = toSet();
  for (E element in this) {
    if (!other.contains(element)) result.remove(element);
  return result;